Determine if ICC 8.1 is present

Determine if ICC 8.1 is present

how canI determine at compile-time whether the ICC is being used or not? I'm writing a class using SSE that will go into a bigger framework, and not everyone using the FW will have ICC installed. Is there anything like "#ifdef ICC8" that I can use to exclude my class from being compiled if ICC is not installed on the user's system?